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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76985cfe2c6e5b70c37e1c0f7233cade660953e007b9b24dc3c23e7b96631bad' 
  AND token = '5PC1INqgedb99HlhDpYuJ1icYuV4Xv4GhIPUiwHEkZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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