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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712bb9e33f986123497cc51f8cb111abe397e0511fe92ec2fd61dfb1a81c3519' 
  AND token = 'I4EIRI2cLWu6cpoBWoNWDMs4HwOF/Fh0AfVa/4e33BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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