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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf414a9f2258c5e5b07a7439a1ac98f79a7ecb5b5988acc2bb7b5651e34b72df' 
  AND token = 'AksqSl7ztZNXoDJPsHULzFil2VDDx5JXF2MGXb92xq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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