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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608209851d9b68fcf1b344f2393124d74e990685c8fd58b7a07f20f676ce1c06' 
  AND token = 'sbVujlkg3yJ9FsPUM683yLclfpABiLVG658Ee1kXn/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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