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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08705aab57b548d2358cdbd123c8f3f968ccce864d4de73a4e37a37145de721d' 
  AND token = 'pdQ2PoHOrVUu5pbsUMG8KszFtgaT2uKBikTfGiFkMTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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