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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82032c1e53f88422adc70528b9cac9298e6cff265a39769249104d6447e3e310' 
  AND token = 'qI9cURozWZ0BzAq4C/ahRhwWcXU+1NdXTezfTjjDWUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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