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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ce1f0364399c5a5d0c07b1fa4217cc0e70a510435b6906871f4bf586dfaf61' 
  AND token = 'Z8impHibjJJ7M6i2pNsdWfhLaUgapHqkD498YpLWL1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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