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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ac365d49534836a0ba0ce2f7005b9c8b827c05a7c085345a670a32226731f1' 
  AND token = 'J9ZkBNV3PA8mRCUbyD90Td/c2di8SVedSJXJm+Hnulc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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