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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e16e09f5789ec3eddecbbd528033ea2b07c7c92fdf300a0f1f6330bb471459' 
  AND token = '1vijeMdLA+IZy5vOhlH9E5EnKqmJJkrXji6B7PWfgr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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