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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbb3d28f661f0ecef39acb6331df9dc1bff3c5f6e3b17f9b036dbfc4034d762' 
  AND token = 'mWyNRCci7vhDgGK4rK54DEayWQn5W17TwBoHIiaPUpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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