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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf861aef339a9c35168d33a934a676d1f4e264967d9f9e5cc3cdf8c91d8231dc' 
  AND token = '1hKAbwNVaoBl1ll5vE0a2PsfnJEj2//To/gBerNLDXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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