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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa011a8af2aac829de5c94dda4e3b0dc215ce1787c6524cfc61e0a546db4130f' 
  AND token = 'gbqmzSD617Ke4HpcaSDa8RC03nN2oaNR4QXkikLfvkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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