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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c26175d5f67cc5ca43db301ad139889adb4f3c8116550fc34747cceff78548a' 
  AND token = 'HQwW/V5ZXWgQHml4zA4yUkHVNVOcd1A5J0vmIIAssL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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