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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c1764ae8d1ec1aa93fb21e05602d657976e8c2f4e496ab6c958c3ca07a7c26' 
  AND token = 'BpTNYbTtTQQFLdojBHCVek5wwXubmgDtojNZCDeWYR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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