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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e201dab1d2be4558edc868dbc022587b756a226c5aec3efc2bcc4a6b280a530f' 
  AND token = '2ct1eiPH4tSb6Z7l32J8iLshInzf930J6p7BzSA7g3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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