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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f44b1d344b630b91a5167b8e692c99e54bf1c00ee17fc80a0ed8e971c27aae4' 
  AND token = 'tXVifzXw03Uy6ycpKe3fxXkAsMJoTixL1us+ttdzV9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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