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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560b62d8c7f43e9b4e5ab644eed8cd2ae79c1de74acc705eee0b49acec55b9ca' 
  AND token = 'cHR8+02Sj1l8SluZDHrvCMUP+Wz7H0PSXXIZgYmvVkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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