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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de09fce747eac53655e9b2fc8542c4372bd131ff9c3b4b176c8df10c89420f59' 
  AND token = 'wNIWJPJcHMIIBSyt2Qu9/XMCyW69XpYyNsu0fYFsvtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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