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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e766b848904bc4589e8726f87aefb4d5883686b7ef273e9dcce1d24e07ab4db' 
  AND token = 'bbPELRNgJRSD7DiDVTzR0RtKwqB2x03LZwuV/89Whmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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