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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb30f62b3a2efe1334153a07d010053d839de8f1c92b2dc20b2350ee62901ca' 
  AND token = 'Yz+s+e1UizMGv2ErssVSYYMnwqbeEeYuYFmLWyYhkmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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