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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6809dcc581f4fd2a1a5ff23f44bca20b1dd10d2ef58a5f3b68e32d58d872e67d' 
  AND token = '6ciN8c7r6ffEXNAbx+vmfoMPdT3k9HPvNi1kSNJJJuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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