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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12136dac7fddbee6ab9e40e47c7f8675a86d0b1e4bcbc017913ab691ac7dad7' 
  AND token = '3GLiRMxMjhE0XK2JeQ/+XN0HdSVQu3LFBjOTduaKW5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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