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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3b00c90cf652ca039ff4098da62145dc7eaa0b097b6b603b0f6598c3d09466' 
  AND token = 'uOOeFOyPUw1WyZkawYNvVORiQJv2rLscOemz/SV4IDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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