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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda7fc82e01a7c4db03ba262fc32d495c163d77a330fe2e39a1987c74aa4629d' 
  AND token = 'NmD/4xfhl0gkWRVIKpRpalUcD2kGSAHiarRt/Mhcwk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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