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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecea2eefe67dd1113cf4a40f336ca9e0c10a4766ed899b0a47cf912283df6b9d' 
  AND token = 'WioXU376AbhruF3DIKPXVjtN4bfahH0r0k61vSdE+9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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