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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a059daccc87be2e4ee971de34db5af4cd31f907c933df68d8f8d432dc4c69a' 
  AND token = 'qcinCWyai87m3uRbpFsTuRz42tI4P8lU1t21oLvSUkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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