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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e52f9fb81200a3c464e31e4471047a5a6000a0698e98df6c0b1d6464367459a' 
  AND token = 'SOyxDY1qJRTjclL3MCWZbCZeQI8ebjkCQ/pbdARaqEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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