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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655da4dc3d621f512cc9c5a4b10913e15f4e1076b1f19b1d9de36b98e130f4d7' 
  AND token = 'fLe97rT9E/23FcQz6IJne1uouSmb99q3PIwr8vxQ/Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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