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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a7118d8a93091d13943abc625a09a41ba7399899d1cea75094f1a5aeee9ff6' 
  AND token = 'IaeWBavw6WnFX80iidMmDwHrT3+mveOE/IRGkr5A93c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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