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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf96e8ebbdeb7f5617960fd68b23e2fb54a3ff9da4e07993749fecf5b42764b0' 
  AND token = 'PRQ+6gAuquXpE1q9Y9ExnumhRonOIGzPHucbZssc0Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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