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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0e6be5adc8539c44ecf0a71d0f4955a5bf11ebe64d2b8f2079aee7b370a3b3' 
  AND token = '89+MiX74bwkPAOn60OXMu1Dea+j+dMm6HK+EJsKILDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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