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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e229b4b7da629dfb0be7a575d782b4159d9002621d1b5b7b72834618a6bd81bb' 
  AND token = '6lWRLOuzUT3N1N4S+PBWz2OVGkJW+3Rpgde97VvuD9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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