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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1167ad507ff4e92212e5a13a9f504acd7b80c2e5024f4859dc5a3123db4628b' 
  AND token = 'MSMvPaNEdN/kPf7ChzgBFbf7qGSowZrWMpAx5o/VblE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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