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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbace3b1681c5bfd47177b4a45c44412ae0d2a04192dd62834a0686f3d3eca37' 
  AND token = 'Sw5KBI05B1qkZulfyIJX+OngcCSZC94ZjUkB754a9uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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