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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e27b769e3eaf0b50ea10d2554778bc95db944f1bb510d4c91f77dc96920989' 
  AND token = 'CmSLnzZ0qyUoCm/9WLFHK6PWvVeeMtY87hRnCV0uYak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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