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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093a33bd529da2a136aaae459daad8b34b1cead82220d0ee09ec5cea4f5ba23b' 
  AND token = 'YWBU46YifXo6F68G4GpAmxqSzJe0NjdQ15ZB+qd4Nzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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