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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df2e5c0eeafe2b2bed70670f5489fd7ac7320fbc3eff6d005ddfbe8dec92541' 
  AND token = '56CNLb4L3LxitNe6bRGW7eUCh6Votz87+SmTmdIH2Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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