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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da84e0ffd17fb43597d0f3128ca1308459e614d63a0f33e10f7fd976b3d3e795' 
  AND token = 'tSjg6GlcPRdmTzCjIrMAGHG4KkHtKVgDlt0IGq1qMAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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