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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd17290eaf0e2f2138edbbe31ddce9e87379e2f7f5321766d12df858ea3980b' 
  AND token = 'aeunGe3daf2D0nOfrc5hvawHe4fx7/JYvNXGVo4l3q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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