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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb057871868ea0ec8fd9ded9cbf25a6770862ea1f34927f0b3f5a061e6c56d1' 
  AND token = 'GdE48CcSo9+ikZfaF+d+JnRCia7seGHFy67YDKPxfaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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