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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21a48e9c0f7260376b1f3b489796161b301d7fabcab5d09173ddd127c45b5e20' 
  AND token = 'unrAm3PIn+pvJef4wfoHJ2r9BiaLahiNZk8oXZzLFHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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