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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3766c6aa1a1995479f46887e86f534eba594d5837705647cf8548952a3d2992' 
  AND token = 'YI4p4u3SxkrIbRjkykN35zMuIrlljkmhZa3hnYv9i5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}