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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895d8c29b18f4f90a8afb4d465505794d40dfe59dba86a8958a40a0fe59b393a' 
  AND token = '11mNw0sHrMUSJaSZRfLlNz4X/Wb+aFoU0ryqugRhzPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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