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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1007f1bad0987c54dc35fb8a98067c6384426a9a2c2dda31385e8cff856cf6' 
  AND token = 'zJbStfDiOElvjDRnXOy1O8IHMAK53KW03iPTbJyBMv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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