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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9061e7c6136c9b0aac668799a3b21dbb61589908764b62dccff61e60c96e31f3' 
  AND token = 'vuGSog4kgZU8lgu9HkE8af0/R+c6KNHI7fPlzlpzV3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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