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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e30240704e618f7a06012c984632cb0051b33d793a01f32b1502ffb05f215e' 
  AND token = 'fMnT46C805UggoOtjufazogkP2U78ORCgeuPDbrGqn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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