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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6268f5c2d02df4ed5cf8c4c9daf5036a629904a0190e414a2b802bd3310153e' 
  AND token = 'gi3vj38G9H+6mDmTI3kBB8Cg5Fr2iu9zzg9QUJY7HSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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