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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c59cc506563e0304b566a8deb2cf37af95339b1f270c6f2b5f2cdcbf7a99eac' 
  AND token = 'fyo1fruAOqk+ldP/4U+Oneb1dJH3U9pp1krOIjx93vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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