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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269463f306fb234f46ca6a023c74c0102cf6a809695b2c5f8f3304db70b14e95' 
  AND token = 'fNJrMCTSLKo0BTDLXKQJm5aiEDUC5LPlQiaBXhOQw6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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