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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a259202c22ce8d0b293e575cb6027cd43dbf2112e8d1167e4036577be2b875' 
  AND token = '0n3JfZDQTV8FNzwszo9yFt51WAJIB06HPWkmK7MPy6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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