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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7b7687ef0820850820ffb200e3b1ee81b457d4573fd437dc24878542098ca1' 
  AND token = 'LGp+/R69Xx7SEco/XlcJm+9WIG4J+KwdGgymKnsn7rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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