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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1336716e8608329caf4b25a7c00aff5e92ff4f0324ae0551fb71e7a7b1f59e' 
  AND token = 'bVxvrNJrmS8O0Be6wSOTlmRaENIABBXUwkvZ1x1MzWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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