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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7687d64367ba387c0b1f44927923a5cd6091c4c11d640a01367daf43bc35f789' 
  AND token = 'dZCVDoJzyjL0yNJOXyGJZMPD+UxmbC6Pyr24TAOcYZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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