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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764f88d1a3cc5b42764bcc175d707e48bd31942cff1b7fe4ffedab601eaad965' 
  AND token = '5ifeH6R8+sf7FjGgj4oZAC5KAja/8w2yGOfEbd6ap6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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