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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3375762ac654dd14d3d30337e14a2ada29dc305542dde5ed90a46c5156c3f2' 
  AND token = 'OocbX0VyW5xnAhQYlEdpRPFU1GTKIKLv/nh+IRjahI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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