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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9233b1682498b902ad28a410526dd59f1f09c50540d0f667d2b7f336e6a54c5' 
  AND token = 'mMMXZ8cOP8LTBCPqN0T+YazdxRat6rx2RNuXIjNXPxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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