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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8ce98482ae82579b9834aeb08464e7b985a0661761ec7eade22daf3103d34b' 
  AND token = 'Ue/dD+YX/+VHIr72yGCsKU4Ol34uWVIxJ+OboBDqSgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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