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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0bbda2eea6eefcb99eafc63fbaa8af6d858bf2db7a7c2ebce8f46660f6578c' 
  AND token = '/HFwlPs7gpDZpx07MnRaaCDWMvy0Ei8GwU+Cpvhi/hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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