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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553bdf54cb19e5f883eb29c5954a52cf3bd42c0f70284e8d58c95eada24fc746' 
  AND token = 'xo7d+13xQtZbNyylYO4U3P490AVmtUxxNMV5+KNtnZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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