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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef05f5144bdb96fe8bb60d1ff4a432278663870e0e91e7fe1d7bdbe7084221cf' 
  AND token = 'UjYASB0aOUmVI02mizhq6sGzp98X0a6bIvXHb9sVICQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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