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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4688e92110650ce4db622e37b2b36401213f8ba11404a51a3d3704943c1b195' 
  AND token = 'XA0/x5H5DnwqnZkVOmNzN1b6EjYIT/G1iSb9VpS6L3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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