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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c079b708b13fb387f6cd18e47a1c40b1b7bb6cb2d514d6aa21d05bc07082d3' 
  AND token = 'eYIDjvI6tCpuhGO6q7KMt38XZ9eFKKXtI2+bjLucIro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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