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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363a41af5281f2752d6e988013308ef16f980b26441186670a9edd5c1bbe31c7' 
  AND token = 'TFmq+R2uI8wKAv8Xc9YIatap4hJamRJBA3j0V3o+aOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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