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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d65dcf98e27f0d4c2a8ac23c5f7fc0052548353e8f145835c425aac9c8ff8e' 
  AND token = '5QY1unoTid+45JrkgFpc+pUdAkahl0fOpQYYPY1Zw7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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