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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c2ac9ae2884639c55b1195970ba511580903ba62b92ff4d5fb2b5fb456c9ed' 
  AND token = 'HH8M6XEGfvMA/6LKaJBbAV6v4x1SsMPkdghovsSvf9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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