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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce8b38fef09b3b1b306c51d73c88a0ec3ea0f861bbe5aec23c83ececff2b341' 
  AND token = 'i6eyMPQoJsxybAU6+HvwudwDLtiMdkELOpzTswrBJWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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